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| DOI：10.13522/j.cnki.ggps. 2023154 |
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| Characteristic Analysis of Hydraulic Transition Process of Water Conveyance System in Urban Deep Tunnel |
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FENG Yan, ZHANG Qin, QU Fangle
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PowerChina ZhongNan Engineering co.,Ltd, Changsha 410014, China
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| Abstract: |
| 【Objective】The purpose of this paper is to study the characteristics of the hydraulic transition process of the urban deep tunnel water delivery system. 【Method】First, take specific engineering examples as the research object and use Bentley hammer software to establish a water delivery system model. Then, analyze the influence of the pump start interval on the stability of the water delivery system, and further analyze the influence of the pipeline roughness on the stability of the water delivery system under typical working conditions. Finally, explore the impact of adding 3# shaft as a surge tank on the stability of the water delivery system. 【Result】The results showed that when the pumping interval was longer than 240 s, the lowest transient water level of shaft 2# tended to be stable. The greater the roughness of the pipeline, the lower the lowest transient water level under pump-starting conditions, the greater the surge water level overshoot under pump-off conditions. The addition of 3# shaft as a surge tank had little effect on the extreme value of water hammer pressure in the water delivery system.【Conclusion】The pumping interval is longer than 240 s, it has almost no effect on the stability of the water delivery system. The greater pipe roughness is unfavorable for the system stability under typical working conditions. The addition of 3# shaft as a surge tank requires a lot of maintenance costs, and has little effect on the extreme value of water hammer pressure in the water delivery system, so it is not recommended to set it as a surge tank. |
| Key words: deep tunnel; water delivery system; hydraulic transition process; shaft; Bentley hammer |
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